$18.$ Assume that a dataset has a normal distribution, and the number of observations is $104.$ Find the critical t value used to test a null hypothesis where $=0\mathrm{.}10$ for a left$-$tailed test.

a$.1\mathrm{.}660$

b$.1\mathrm{.}290$

c$.1\mathrm{.}286$

d$.1\mathrm{.}984$